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CppCon 2019 has ended
Wednesday, September 18 • 16:45 - 17:45
Type punning in modern C++

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Type punning is often used in C++ for fast floating-point math, deserialising C++ objects from a sequence of bytes, and other purposes. Popular techniques involve unions, reinterpret_cast, and memcpy. C++20 provides new useful tools, such as bit_cast. And there are proposals to provide even better control over C++ object creation in the future.

This talk is a comprehensive overview of all of these techniques. We will discuss when and how they can be used safely without causing undefined behaviour, what C++ does and does not allow you to do (and why), existing holes in the C++ language, and how to fix them. In the process, we will cover important C++ concepts such as object lifetime, value representations, and aliasing rules.

Speakers
avatar for Timur Doumler

Timur Doumler

Timur Doumler is a C++ developer specialising in audio and music technology, active member of the ISO C++ committee, and part of the includecpp.org team. He is passionate about building communities, clean code, good tools, and the evolution of C++.


Wednesday September 18, 2019 16:45 - 17:45
Aurora A

Attendees (289)




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